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//
//  ========================================================================
//  Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.server;

import java.security.cert.X509Certificate;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLSession;

import org.eclipse.jetty.http.HttpScheme;
import org.eclipse.jetty.io.ssl.SslConnection;
import org.eclipse.jetty.io.ssl.SslConnection.DecryptedEndPoint;
import org.eclipse.jetty.server.ssl.ServletSSL;
import org.eclipse.jetty.server.ssl.SslCertificates;
import org.eclipse.jetty.util.TypeUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;

public class SecureRequestCustomizer implements HttpConfiguration.Customizer
{
    private static final Logger LOG = Log.getLogger(SecureRequestCustomizer.class);
    
    /**
     * The name of the SSLSession attribute that will contain any cached information.
     */
    public static final String CACHED_INFO_ATTR = CachedInfo.class.getName();


    @Override
    public void customize(Connector connector, HttpConfiguration channelConfig, Request request)
    {
        if (request.getHttpChannel().getEndPoint() instanceof DecryptedEndPoint)
        {
            request.setScheme(HttpScheme.HTTPS.asString());
            request.setSecure(true);
            SslConnection.DecryptedEndPoint ssl_endp = (DecryptedEndPoint)request.getHttpChannel().getEndPoint();
            SslConnection sslConnection = ssl_endp.getSslConnection();
            SSLEngine sslEngine=sslConnection.getSSLEngine();
            customize(sslEngine,request);
        }

    }

    /* ------------------------------------------------------------ */
    /*
     * Allow the Listener a chance to customise the request. before the server
     * does its stuff. 

     * This allows the required attributes to be set for SSL requests. 

     * The requirements of the Servlet specs are:
     * 
     *  an attribute named "javax.servlet.request.ssl_session_id" of type
     * String (since Servlet Spec 3.0).
     *  an attribute named "javax.servlet.request.cipher_suite" of type
     * String.
     *  an attribute named "javax.servlet.request.key_size" of type Integer.
     *  an attribute named "javax.servlet.request.X509Certificate" of type
     * java.security.cert.X509Certificate[]. This is an array of objects of type
     * X509Certificate, the order of this array is defined as being in ascending
     * order of trust. The first certificate in the chain is the one set by the
     * client, the next is the one used to authenticate the first, and so on.
     * 
     * 
     *
     * @param request
     *                HttpRequest to be customised.
     */
    public void customize(SSLEngine sslEngine, Request request)
    {
        request.setScheme(HttpScheme.HTTPS.asString());
        SSLSession sslSession = sslEngine.getSession();

        try
        {
            String cipherSuite=sslSession.getCipherSuite();
            Integer keySize;
            X509Certificate[] certs;
            String idStr;

            CachedInfo cachedInfo=(CachedInfo)sslSession.getValue(CACHED_INFO_ATTR);
            if (cachedInfo!=null)
            {
                keySize=cachedInfo.getKeySize();
                certs=cachedInfo.getCerts();
                idStr=cachedInfo.getIdStr();
            }
            else
            {
                keySize=new Integer(ServletSSL.deduceKeyLength(cipherSuite));
                certs=SslCertificates.getCertChain(sslSession);
                byte[] bytes = sslSession.getId();
                idStr = TypeUtil.toHexString(bytes);
                cachedInfo=new CachedInfo(keySize,certs,idStr);
                sslSession.putValue(CACHED_INFO_ATTR,cachedInfo);
            }

            if (certs!=null)
                request.setAttribute("javax.servlet.request.X509Certificate",certs);

            request.setAttribute("javax.servlet.request.cipher_suite",cipherSuite);
            request.setAttribute("javax.servlet.request.key_size",keySize);
            request.setAttribute("javax.servlet.request.ssl_session_id", idStr);
        }
        catch (Exception e)
        {
            LOG.warn(Log.EXCEPTION,e);
        }
    }

    @Override
    public String toString()
    {
        return String.format("%s@%x",this.getClass().getSimpleName(),hashCode());
    }
    
    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /**
     * Simple bundle of information that is cached in the SSLSession. Stores the
     * effective keySize and the client certificate chain.
     */
    private static class CachedInfo
    {
        private final X509Certificate[] _certs;
        private final Integer _keySize;
        private final String _idStr;

        CachedInfo(Integer keySize, X509Certificate[] certs,String idStr)
        {
            this._keySize=keySize;
            this._certs=certs;
            this._idStr=idStr;
        }

        X509Certificate[] getCerts()
        {
            return _certs;
        }

        Integer getKeySize()
        {
            return _keySize;
        }

        String getIdStr()
        {
            return _idStr;
        }
    }



}